Autor: Górniak, Dorota - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Vertical microzonation of ciliates in cryoconite holes in Ecology Glacier, King George Island
Autorzy:: Mieczan, Tomasz
Tarkowska-Kukuryk, Monika
Górniak, Dorota
Świątecki, Aleksander
Zdanowski, Marek
Adamczuk, Małgorzata
Powiązania:: https://bibliotekanauki.pl/articles/2051401.pdf
Data publikacji:: 2013
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: Antarctic
cryoconite holes
protozoa
biodiversity
Źródło:: Polish Polar Research; 2013, 2; 201-212
0138-0338
2081-8262
Pojawia się w:: Polish Polar Research
Dostawca treści:: Biblioteka Nauki

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Tytuł:: Weathering in a regolith on the Werenskioldbreen Glacier forefield (SW Spitsbergen). 2. Speciation of Fe, Mn, Pb, Cu and Zn in the chronosequence
Autorzy:: Rzepa, Grzegorz
Manecki, Maciej
Jakubski, Grzegorz
Kwaśniak-Kominek, Monika
Czerny, Jerzy
Górniak, Dorota
Powiązania:: https://bibliotekanauki.pl/articles/191866.pdf
Data publikacji:: 2019
Wydawca:: Polskie Towarzystwo Geologiczne
Tematy:: retreating glaciers
incongruent dissolution
sequential chemical extraction
global warming
Opis:: The evolution of chemical speciation of Fe, Mn, Pb, Cu, and Zn was investigated in the chronosequence of young sediments, exposed by a currently retreating Arctic glacier on Spitsbergen. Werenskioldbreen is a 27 km² subpolar, land-terminated, polythermal glacier in recession, located near the SW coast of West Spitsbergen. Three samples of structureless till were collected at locations exposed for 5, 45 and 70 years. Four grain-size fractions were separated: > 63, 20–63, 2–20, and < 2 µm. Speciation of Fe, Mn, Pb, Cu, and Zn was determined using a 6-step sequential chemical extraction method: 1) 1 M sodium acetate, 2) 1 M hydroxylamine hydrochloride in acetic acid, 3) sodium dithionite in buffer, 4) acid ammonium oxalate, 5) boiling HCl, 6) residuum. The weathering in the proglacial area of the retreating glacier is very fast. The geochemical fates of the metals in question correlate with each other, reflecting a) the geochemical similarities between them, b) the similarities of their primary mineral sources, c) the significant role of incongruent dissolution. The weathering processes dominating the system are redox reactions and incongruent dissolution, followed by precipitation of secondary phases and partial sorption of aqueous species. As a result, the elements released from weathering minerals are only partially transported away from the system. The remaining part transforms by weathering from the coarse-grained fraction (dominated by fragments of primary minerals) into the fine-grained fraction (in the form of secondary, authigenic minerals or as species sorbed onto a mineral skeleton). This is very strongly pronounced within the chronosequence: the content of each of the metals studied correlates identically with the grain size, despite the differences in their chemical character and affinities. The microscope study presented herein indicates that the role of incongruent dissolution previously was underestimated. Also, the formation of coatings of secondary phases on primary mineral surfaces was observed. All these rapid weathering processes affect the mineral speciation of initial soils as well as the composition of mineral suspensions transported away by rivers to the nearby ocean.
Źródło:: Annales Societatis Geologorum Poloniae; 2019, 89, 3; 317-341
0208-9068
Pojawia się w:: Annales Societatis Geologorum Poloniae
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Microbial biodiversity in arable soils is affected by agricultural practices
Autorzy:: Wolińska, Agnieszka
Górniak, Dorota
Zielenkiewicz, Urszula
Goryluk-Salmonowicz, Agata
Kuźniar, Agnieszka
Stępniewska, Zofia
Błaszczyk, Mieczysław
Powiązania:: https://bibliotekanauki.pl/articles/972735.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:: dgge
16s rrna gene
simpson diversity
bacterial communities
arable soils
Opis:: The aim of the study was to examine the differences in microbial community structure as a result of agricultural practices. Sixteen samples of cultivated and the same number of non-cultivated soils were selected. Gel bands were identified using the GelCompar software to create the presence-absence matrix, where each band represented a bacterial operational taxonomic unit. The data were used for principal-component analysis and additionally, the Shannon-Weaver index of general diversity, Simpson index of dominance and Simpson index of diversity were calculated. Denaturing gradient gel electrophoresis profiles clearly indicated differentiation of tested samples into two clusters: cultivated and non-cultivated soils. Greater numbers of dominant operational taxonomic units (65) in non-cultivated soils were noted compared to cultivated soils (47 operational taxonomic units). This implies that there was a reduction of dominant bacterial operational taxonomic units by nearly 30% in cultivated soils. Simpson dominance index expressing the number of species weighted by their abundance amounted to 1.22 in cultivated soils, whereas a 3-fold higher value (3.38) was observed in non-cultivated soils. Land-use practices seemed to be a important factors affected on biodiversity, because more than soil type determined the clustering into groups.
Źródło:: International Agrophysics; 2017, 31, 2; 259-271
0236-8722
Pojawia się w:: International Agrophysics
Dostawca treści:: Biblioteka Nauki

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